﻿//===============================================================================
// Microsoft patterns & practices Enterprise Library Contribution
// Resource Application Block
//===============================================================================

using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ObjectBuilder;
using Microsoft.Practices.EnterpriseLibrary.Data;
using Microsoft.Practices.ObjectBuilder2;
using EntLibContrib.Resource.Providers;

namespace EntLibContrib.Resource.Configuration
{
	/// <summary>
	/// This type supports the Enterprise Library infrastructure and is not intended to be used directly from your code.
	/// Represents the process to build an <see cref="DataResourceProvider"/> described by a <see cref="DataResourceProviderData"/> configuration object.
	/// </summary>
	/// <remarks>This type is linked to the <see cref="ResourceProviderDataBase"/> type and it is used by the <see cref="ResourceProviderCustomFactory"/> 
	/// to build the specific <see cref="IResourceProvider"/> object represented by the configuration object.
	/// </remarks>	
	public class DataResourceProviderAssembler : IAssembler<IResourceProvider, ResourceProviderDataBase>
	{
		#region Public Methods
		/// <summary>
		/// This method supports the Enterprise Library infrastructure and is not intended to be used directly from your code.
		/// Builds a <see cref="DataResourceProvider"/> based on an instance of <see cref="DataResourceProviderData"/>.
		/// </summary>
		/// <param name="context">The <see cref="IBuilderContext"/> that represents the current building process.</param>
		/// <param name="objectConfiguration">The configuration object that describes the object to build. Must be an instance of <see cref="DataResourceProviderData"/>.</param>
		/// <param name="configurationSource">The source for configuration objects.</param>
		/// <param name="reflectionCache">The cache to use retrieving reflection information.</param>
		/// <returns>
		/// A fully initialized instance of <see cref="DataResourceProvider"/>.
		/// </returns>
		/// <seealso cref="ResourceProviderCustomFactory"/>
		public IResourceProvider Assemble(IBuilderContext context,
																			ResourceProviderDataBase objectConfiguration,
																			IConfigurationSource configurationSource,
																			ConfigurationReflectionCache reflectionCache)
		{
			// cast the configuration data to the specifc data type
			DataResourceProviderData castObjectConfiguration = (DataResourceProviderData)objectConfiguration;
			// create a builder context for the Database Access Application Block database builder
			IBuilderContext databaseContext = context.CloneForNewBuild(NamedTypeBuildKey.Make<Database>(castObjectConfiguration.DatabaseInstanceName), null);
			// build a database
			Database database = (Database)databaseContext.Strategies.ExecuteBuildUp(databaseContext);
			// create the resource provider
			IResourceProvider createdObject = new DataResourceProvider(database,
																																castObjectConfiguration.ResourceBaseName);
			// return the fully built and populated resource provider object
			return createdObject;
		}
		#endregion
	}
}
